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contrldsub
04-19-2013, 03:58 PM
when i accelerate and the tubro builds boost it sounds like a bird on crack. its a loud whistling/fluttering sound. that turns into a solid hiss at higher RPMs. anyone insight about this? AWM

estraudiA5
04-19-2013, 05:23 PM
It could possibly be the actual sound of what a turbo sounds like when its doing its business. At higher RPM's for the engine the turbo will be between 100,000-200,000 RPM's so it will sound like an industrial strength blowdryer. Flutter if I'm correct happens when you let off the throttle and boost is being forced back down the turbo's throat and thats not good. Blow-off Valve does the trick sometimes.

contrldsub
04-19-2013, 06:24 PM
yeah... ive had a few turbo cars, never had this sort of noise. its a whistling flutter, and it happens under acceleration not decel.

A4F3V3R
04-19-2013, 07:54 PM
Stock diverter valve? Maybe be on its way

contrldsub
04-19-2013, 07:55 PM
ill look into it. it was fine for a while and then i did a cabon cleaning. maybe i loosened some crap up

redline380
04-19-2013, 08:32 PM
turbo is probably bad. check shaft play

contrldsub
04-20-2013, 05:34 PM
turbo isnt bad. replaced less than 3000 miles ago. no shaft play. no drilling noise, no smoke, no oil in intake tubes

the noise turns into a loud hissing sound at higher pressure's i smoke tested and had no leaks. also today while pulling a hill i had noticably less power then all of a sudden it came back, still make the noise tho. can the N75 cause this? i dont know enough about the audi set up it seems.

seanj130
04-20-2013, 08:02 PM
Sounds like the DV

redline380
04-20-2013, 10:06 PM
turbo isnt bad. replaced less than 3000 miles ago. no shaft play. no drilling noise, no smoke, no oil in intake tubes

the noise turns into a loud hissing sound at higher pressure's i smoke tested and had no leaks. also today while pulling a hill i had noticably less power then all of a sudden it came back, still make the noise tho. can the N75 cause this? i dont know enough about the audi set up it seems.


this kind of info would be very helpful in the first post. yes, it sounds like a dv in that case you are bleading boost pressure somehwere

contrldsub
04-21-2013, 07:55 AM
sorry bout that. ill look into the DV this afternoon. is there any effective way to test it?